diff mbox series

[v2,02/12] property: Return true in fwnode_device_is_available for NULL ops

Message ID 20201217234337.1983732-3-djrscally@gmail.com (mailing list archive)
State Superseded, archived
Headers show
Series Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows | expand

Commit Message

Daniel Scally Dec. 17, 2020, 11:43 p.m. UTC 
Some types of fwnode_handle do not implement the device_is_available()
check, such as those created by software_nodes. There isn't really a
meaningful way to check for the availability of a device that doesn't
actually exist, so if the check isn't implemented just assume that the
"device" is present.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes in v2:

	- None

 drivers/base/property.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Sakari Ailus Dec. 21, 2020, 9:10 a.m. UTC | #1 
On Thu, Dec 17, 2020 at 11:43:27PM +0000, Daniel Scally wrote:
> Some types of fwnode_handle do not implement the device_is_available()
> check, such as those created by software_nodes. There isn't really a
> meaningful way to check for the availability of a device that doesn't
> actually exist, so if the check isn't implemented just assume that the
> "device" is present.
> 
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Daniel Scally <djrscally@gmail.com>

For this and the 3rd patch:

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
diff mbox series

Patch

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4c43d30145c6..bc9c634df6df 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -785,9 +785,15 @@  EXPORT_SYMBOL_GPL(fwnode_handle_put);
 /**
  * fwnode_device_is_available - check if a device is available for use
  * @fwnode: Pointer to the fwnode of the device.
+ *
+ * For fwnode node types that don't implement the .device_is_available()
+ * operation, this function returns true.
  */
 bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
 {
+	if (!fwnode_has_op(fwnode, device_is_available))
+		return true;
+
 	return fwnode_call_bool_op(fwnode, device_is_available);
 }
 EXPORT_SYMBOL_GPL(fwnode_device_is_available);